Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cad53c8f78c06f…

MALICIOUS

PDF

73.6 KB Created: 2021-02-11 14:56:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8c11288051a16054e1dfed73db7be516 SHA-1: 10d0418853889ca586d798a5fc01e416beb05b16 SHA-256: 40cad53c8f78c06f4b916bf29cf67b39afabad6e8052bae0be3d87af3eee08b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=edward+said+culture+and+imperialism+citation PDF link annotation
    • http://xeeewq.xyz/anova_sous_vide_instruction_manual236r4.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/4jaA5i4/battle_simulator_royale.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/sizunizusor6ih4i.pdfIn PDF document text
    • https://ninijaliwejito.weebly.com/uploads/1/3/4/3/134350726/d7688c065dd.pdfIn PDF document text
    • http://smm-target.ru/25658970825excec.pdfIn PDF document text
    • https://cdn.sqhk.co/gabisolovima/fidiexk/smart_sync_cloud_storage.pdfIn PDF document text
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/madum_bujijode_miwoneripino.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/wiaot0I/84657733613.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/sebusojobulinozop.pdfIn PDF document text
    • https://pojikajuruwasi.weebly.com/uploads/1/3/2/6/132695468/fugezidojaxudaf.pdfIn PDF document text
    • https://cdn.sqhk.co/refuvowur/ha3ZYge/wezexuzudupi.pdfIn PDF document text
    • https://pavadugubuwab.weebly.com/uploads/1/3/4/3/134309483/cb2517041878b.pdfIn PDF document text
    • http://profaudit32.ru/books_on_subconscious_mind6cir8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faxipobusevive.rf.gd/balew.pdfIn PDF document text
    • https://s3.amazonaws.com/pasutiz/gitupudametujeletalogixa.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/employee_registration_form_sample.pdfIn PDF document text
    • http://pugagewuda.rf.gd/19544631605.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/78569085735.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/angiofibroma_adalah.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 5268 bytes
SHA-256: 959ff61564850f1c846b52ef7d35d44325b51f82bbc14b0e40554d046aa44a82
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10560 bytes
SHA-256: 7ed26f130c373396e761fa7a1186eb9394d19ef2574b2724698af63884a98a7f